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Analysis of Voltage and Current Signal Processing in a Li-ion Battery Management System

A Battery Management System (BMS) manages Li-ion batteries in a storage system for pulsed power weapons aboard Naval vessels. The system charges the batteries with a buck converter according to the Constant Current Constant Voltage method. The BMS uses analog equipment to measure signals and then digitally converts signals for transmittal to a Field Programmable Gate Array (FPGA).

Posted in: Briefs, Electronics & Computers, Analysis methodologies, Lithium-ion batteries, Marine vehicles and equipment, Military vehicles and equipment
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Development of Soldier Conformable Antennas Using Conducting Polymers

Soldiers performing dismounted operations in the field use radios that have antennas with a distinct visible signature and can become easy targets. These antennas also tend to snag on other equipment or vegetation, creating a hazard and a distraction to any ongoing operation. Therefore, it has become necessary to develop an antenna that can conform to soldiers and be virtually indistinguishable from a soldier’s body armor.

Posted in: Briefs, Manufacturing & Prototyping, Antennas, Radio equipment, Protective clothing, Military vehicles and equipment
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Variable-Thrust, Multiple-Start Hybrid Motor Solutions

Interceptor boost propulsion has traditionally been dominated by solid rocket systems due to their responsiveness and high mass fraction capabilities. However, increased costs of handling these flammable motors, the need to evolve more and more insensitive munitions, the static thrust profile created at propellant casting, and the inherent performance limitations of solid propellants have motivated the interest in exploring alternate technologies.

Posted in: Briefs, Mechanical Components, Solid propellants, Product development, Hybrid engines
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Wheel Force Transducer

Aconcept wheel force transducer has been developed that can measure the forces and moments between a tire and a road on a High Mobility Multi-purpose Wheeled Vehicle (HMMWV or Humvee) driven under off-road conditions. The proposed wheel force transducer is an important step in correcting the gap in current tire testing and modeling knowledge to ensure that future off-road vehicle models and simulation efforts are conducted with confidence. In order to obtain tire characteristics over off-road terrain, cost-effective field test equipment was required.

Posted in: Briefs, Mechanical Components, Tires and traction, Wheels, Test equipment and instrumentation, Off-highway vehicles and equipment
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Quasicrystalline Aircraft Coating Shows Promise for Cookware, Prosthetics

A technology initially designed to lubricate aircraft parts could lead to more durable nonstick cookware and prosthetic bone-repair implants.

Posted in: Tech Transfer Reports, Coatings & Adhesives
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Thin Film Fixes Flaws in Thermal Battery Igniters

Unlike alkaline batteries used in common consumer electronic items, thermal batteries are inert, solid-state devices that do not rely on liquid electrolytes, which can corrode or leak from their casings over time. Long shelf life and reliability make thermal batteries the most common device to power missile navigation and control systems.

Posted in: Tech Transfer Reports, Energy Storage
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14-Bit Analog-to-Digital Converter

The 14-bit ADS4149 from Texas Instruments (Dallas, TX) is a high-speed analog-to-digital converter (ADC) that delivers low power consumption and performance across wide signal bandwidths from DC up to 550 MHz. It features a maximum sample rate of 250 mega-samples per second (MSPS) and consumes as little as 275mW per channel at that rate, while offering 72.5-dB SNR at 100-MHz input frequency. Dynamic power scaling reduces power consumption to 215mW at 160 MSPS.

Posted in: Products, Products, Electronics & Computers
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Chassis Mount Power Supplies

XP Power (Sunnyvale, CA) has announced the VCS series of chassis mount single output AC-DC power supplies aimed at cost sensitive industrial applications. The series comprises 50W, 70W and 100W models and are available with +5, +12, +15, +24 or +48 VDC outputs. A user accessible voltage trim control provides a +/- 10% adjustment of the output voltage allowing for the use of non-standard voltages or to compensate for cable losses. The VCS series accommodates the full universal input range from 90 — 264 VAC without derating, and can provide full output power from -10 degrees C to +50 degrees C without derating, and with derating to +70 degrees C. Start-up is from -20 degrees C.

Posted in: Products, Products, Electronics & Computers
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SDRAM Multi-Chip Modules

Aeroflex Colorado Springs (Colorado Springs, CO) announced the addition of two SDRAM members to its Quantified Commercial off the Shelf (QCOTS) memory family: the 2.5G and 3.0Gbit SDRAM multi-chip-modules (MCM), organized 64M × 40 (UT8SDMQ64M40) and 64M × 48 (UT8SDMQ64M48) respectively. They offer low power consumption at 3.3V and fast access time (133 MHz) with performance guaranteed via a Standard Microcircuit Drawing (SMD). Both products are assured to withstand 100 krad(Si) and are single event latchup immune (SEL) to 111 MeV-cm2/mg. They are offered in a 128-lead flatpack and Q and Q+ qualified.

Posted in: Products, Products, Electronics & Computers
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ARM Cortex-A8 Computer Board

The SBC1651, an ARM Cortex-A8 computer board from Micro/sys (Montrose, CA), features the Freescale Semiconductor i.MX515 CPU at its core and consumes minimal power while operating at 800 MHz. The onboard Stackable USB I/O expansion with USB, I2C and SPI provides access to plug-and-play off-the-shelf I/O boards with A/D, D/A, Zigbee, GPS, mass storage, sensors, and other embedded I/O for industrial measurement and control applications. Combined with a wide range of software operating systems, including WinCE, Linux, VxWorks, and Android, the SBC1651 is suitable for embedded systems designs or upgrading legacy X86 PC/104 systems. On the 104 Form Factor, the SBC1651 offers 512MB SDRAM, 2GB flash, and two SD/MMC card slots for portability and multimedia storage. It offers dual 10/100BASE-T Ethernet, seven serial ports, four USB ports (one On-The-Go). Additional onboard peripherals include a real-time clock, watchdog timer, 1-wire interface, 24 lines of discrete I/O, two PWM outputs, audio support TV out, 24-bit LVDS flat panel display output, 4-wire touchscreen interface, and a SATA HDD port.

Posted in: Products, Products, Electronics & Computers
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